Controlling means for calender doctors



July' 3, 1928.

F. W. LODDING CONTROLLING MEANS FOR CALENDER DOCTORS Filed May 9. 1927 5 Sheets-Sheet 0474].) "may; 1

July 3, 1928. 1,675,363

F. w. LODDING CONTROLLING MEANS FOR CALENDER DOCTORS Filed. May 9, 1927 s Sheets-Sheet 2 July 3, 1928.

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.51 Q" EL a FIF'I T 0 17 0 or- 1 J f7 z 7-5 fiea izf zfgdy Patented July 3, 1928.

UNITED STATES PATENT OFFICE.

FREDERICK W. LODDING, OF WORCESTER, MASSACHUSETTS, ASSIGNOB'TO RICE, RAE-- TON & FALES, INC., WORCESTER, MASSACHUSETTS, A COBIPOBATIOI'. 0! IA!- CQNTROLLING MEANS FOR CALENDER DOCTORS.

Application filed May 9, 1927. Serial No. 189,776.

This invention relates to the doctors used on calenders in the manufacture of paper.

'The principal objects of the invention are to provide an lIIIPIOVQd' form of control for a the doctors which will be moresure and certain in its operation than has been the case heretofore and will not depend upon any complicated mechanical mechanism and to provide means which will be more flexible in operation because it can be controlled electrically through push buttons and rheostats to move the doctors on and off the rolls and regulate their pressure thereon. It is par.- ticularly adapted for the stack roll type of calenders, as well as paper machine dryers and other rolls, and when so used, each doctor can be operated separately, or certa n groups of them can be operated together in accordance with this invention.

Other objects and advantages of the 1nvention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. 1 is an end view of a stack roll calender provided. with a preferred embod1- ment of this invention;

Fig. 2 is a similar view on enlarged scale of one of the doctor controlling devices;

Fig. 3 isa plan of the same;

Fig. 4 is a fragmentary view similar to Fig. 2 showing the position when the doctors are thrown out of position by hand;

Fig. 5 is a view similar to Fig. 2 showing a modification; and

Fi 6 is a wiring diagram.

1 %ave shown the invention as applied to a stack roll calender in which the parts are mounted on a supporting frame 10 and there are a number of rolls 11 arranged in the usual way. The web passes through the machine as usual and obviously two adjacent rolls are rotated in opposite directions with reference to their axes. Therefore the doctors 13 are applied alternately to the rolls from opposite sides.

These doctors are mounted on longitudinal shafts 14 in fixed position. These shaftscan be turned by handles 15 which are fixedly secured to them to move them into normal position as shown in Fig.. 2 or to throw them out entirely as shown in Fig. 4. Freely pivoted on each shaft 14 is a lever 16 which has a snap book 17 for engaging over a pin-18 on the corresponding arm or handle 15. Springs 19 hold these hooks in looking position so that the two levers 15 and 16 normally will move down together and operate as one piece with the doctor.

In the form. illustrated in Figs. 1 and 2, the lever 16 is connected by a link 20 with the plunger 21 of a solenoid 22 or electromagnet as the case may be. The normal position of the parts is shown in Fig. 2. Now

when the current is connected with the solenoid 22, it pulls down the plunger 'and swings the structure 13, 15 and 16 with the pivot shaft 14 into such position that the doctors will be in contact with their respective rolls as shown in Fig. 1. As stated also the latch 17 can be pulled over to the right with the thumb, if desired, and the handle 15 moved upwardly to bring the doc tor down as shown in Fig. 4. When this handle is brought back, the latch will automatically engage it and hold it down.

These parts are mounted on brackets 23 adjustably carried by vertical coupling rods 24, or they can be mounted in any other desired position.

One way in which the electrical connections canbe made is shown in Fig. 6. Here the mains 25 supply the current through a number of circuits 26 to each of the solenoids 22 which are numbered from 1 to 10 inclusive in this figure, each one corresponding with one of the units above described. These are set up so that all of the circuits 26 can be connected with a source of power through a push button 27 if desired or other form of circuit closing means. If it is de-. sired to operate only one group. of magnets, a button or other connector 28 or 29 can be moved or turned to close one of two circuits to connect them up to energize the magnets connected therewith. These oups as shown can be one on each side of t e machine or they can be arranged in other ways as desired; I do not wish to be limited to two groups as any other desired number can be employed. Furthermore, .each circuit 26 can be connected by an individual push button 31 so that any one of the magnets can be operated individually. These push buttons 31 are numbered 1 to 10 inclusive in Fig. 6 to correspond with the magnets.

In each of the circuits 26 I place a rheostat 32, if desired, to regulate the amount of current through the eleotromagnets 22 loo or solenoids. These rheostates are especially applicable when used in connection with solenoids and constitute a means for regulating the pressure of the doctors on their respective rolls.

In the form shown in Figs. 1 and 2, it will be noticed that the doctors press against the rolls when the current is on in the solenoid. This is one way, another way is shown in Fig. 5. Here the elements above mentioned are practically all present and numbered in the same way but the solenoid 22 has its plunger 21 connected with a lever 34. This has a roll 35 on the opposite side of the pivot which, when the plunger is pulled down, presses up on a surface on the bottom of the leyer 16 and forces the doctor down out of contactwith its roll. When the current is not flowing through the solenoid 22, a spring 36, connected to the bracket- 23 and to the lever or arm 16, pulls the latter down and forces the doctor into contact with the roll.

It will be seen from the above that the doctors can be forced against the rolls either by the action of magnets or solenoids direct- 1y. WVhen the latter are used, thepressure can be regulated by the rheostats 32 so as to get any desired pressure. These rheostats can be located in each circuit so that they can be adjusted differently for different doctors.

Each doctor can be released from its cylinder individually or in groups and all of them can be released or put into operation by a single push button. The invention can be arranged either to have the current on while doctoring or to have it on to release the doctors according to the conditions existing. In the fonn in which the solenoid is employed to press the doctor against the roll, the degree of pressure can be varied by the current sent through the solenoid.

Although I have illustrated and described only two forms of the invention, I am aware of the fact that other modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims.

Therefore, I do not wish to be limited to all the details of construction herein shown and described, but what I do claim is:

1. In a calender, the combination with the calender rolls, of a doctor movably mounted for engaging each roll and electrically operated means for controlling the position of the doctors with respect to their rolls.

2. In a calender for the purpose described,

the combination with a series of calender rolls and a corresponding series of doctors, each mounted to move into and out of contact with the roll for cleaning the same, an arm independently pivoted, means for connecting said arm with a doctor to cause them to swing together about their pivot, and eleetro-magnetic means for controlling the pivotal motion of said arms. I

3. The combination with a set of rolls, of a doctor movably mounted for engaging each 'roll and electrically operated means for moving the doctors into contact with their rolls.

4. The combination with a set of rolls, of a doctor for each roll, manual means for moving each doctor away from its roll, and electrically controlled means for moving a plurality of doctors simultaneously into contact with their respective rolls.

5. The combination with a set of rolls, of a doctor for each roll, means for moving each doctor away from its roll, and manual means for moving a plurality of doctors simultaneously into contact with their respective rolls.

6. The combination with a plurality of rolls and a corresponding number of doctors, means for pivotally mounting each doctor so that it can swing into and out of contact with its roll, electro-magnetic means for swinging each doctor on its pivot, means for individually turning the current on or off for each doctor, and means whereby the currents to a group of doctors can be turned on all at once at another time.

7. The combination with a roll and a doctor therefor, of a support, a shaft or rod to which the doctor is fixed, said rod being carried by the support, a handle connected with said rod for turning it, an arm pivoted on said rod, electro-magnetic means for moving said arm, and means for connecting the arm with the handle.

8. The combination with a roll, and a doctor therefor, of a shaft on which the doctor is fixed, an operating handle fixed on the shaft, whereby the doctor can be turned out away from the roll, an arm pivoted on said shaft, a latch on said arm for connecting it with the handle, whereby the arm and handle will move together in one direction and the doctor can be turned into contact with the roll by the operation of the arm, and electrically controlled means for operating said arm.

In testimony whereof I have hereunto affixed my signature.

FREDERICK W. LODDING. 

